 |
| Titel |
The dynamic chamber method: trace gas exchange fluxes (NO, NO2, O3) between plants and the atmosphere in the laboratory and in the field |
| VerfasserIn |
C. Breuninger, R. Oswald, J. Kesselmeier, F. X. Meixner |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 5 ; Nr. 5, no. 5 (2012-05-08), S.955-989 |
| Datensatznummer |
250002859
|
| Publikation (Nr.) |
 copernicus.org/amt-5-955-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| We describe a dynamic chamber system to determine reactive trace gas
exchange fluxes between plants and the atmosphere under laboratory and, with
small modifications, also under field conditions. The system allows
measurements of the flux density of the reactive NO-NO2-O3
triad and additionally of the non-reactive trace gases CO2 and
H2O. The chambers are made of transparent and chemically inert wall
material and do not disturb plant physiology. For NO2 detection we used
a highly NO2 specific blue light converter coupled to chemiluminescence
detection of the photolysis product, NO. Exchange flux densities derived
from dynamic chamber measurements are based on very small concentration
differences of NO2 (NO, O3) between inlet and outlet of the
chamber. High accuracy and precision measurements are therefore required,
and high instrument sensitivity (limit of detection) and the statistical
significance of concentration differences are important for the
determination of corresponding exchange flux densities, compensation point
concentrations, and deposition velocities. The determination of NO2
concentrations at sub-ppb levels (<1 ppb) requires a highly sensitive
NO/NO2 analyzer with a lower detection limit (3σ-definition) of
0.3 ppb or better. Deposition velocities and compensation point
concentrations were determined by bi-variate weighted linear
least-squares fitting regression analysis of the trace gas concentrations,
measured at the inlet and outlet of the chamber. Performances of the dynamic
chamber system and data analysis are demonstrated by studies of Picea abies L. (Norway
Spruce) under field and laboratory conditions. Our laboratory data show that
the quality selection criterion based on the use of only significant
NO2 concentration differences has a considerable impact on the
resulting compensation point concentrations yielding values closer to zero.
The results of field experiments demonstrate the need to consider
photo-chemical reactions of NO, NO2, and O3 inside the
chamber for the correct determination of the exchange flux densities,
deposition velocities, as well as compensation point concentrations. Under
our field conditions NO2 deposition velocities would have been
overestimated up to 80%, if NO2 photolysis has not been considered.
We also quantified the photolysis component for some previous NO2 flux
measurements. Neglecting photo-chemical reactions may have changed reported
NO2 compensation point concentration by 10%. However, the effect on
NO2 deposition velocity was much more intense, ranged between 50 and
several hundreds percent. Our findings may have consequences for the results
from previous studies and ongoing discussion of NO2 compensation point
concentrations. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|